Sites prompt users to fill out advertising surveys or sign up for subscription services to "reveal" the top activation code.

First, a vocabulary lesson. The term "registration code" is a relic of the early 2010s. When One Piece: Pirate Warriors 2 launched on PC (via Steam in 2013), physical copies were rare. Most digital versions simply attached to your Steam account. However, because the game was region-locked for a long time (primarily available in Japan and Europe), users began hunting for "standalone registration codes."

disc using a compatible Blu-ray drive or a hacked PS3 console.

Using pirated software is not just a security risk; it's also a legal one.

You cannot get a "registration code" from Steam directly (it auto-adds to library), but this is the way to guarantee 100% compatibility with no risk of revocation.